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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1ec8c2fd567437fa902dc45c7e4300cde3b0754ae13d955b0c28ecd4315b862' 
  AND token = 'A2B6Zczbk7g5SEDA+11+k0JmcPpZ7Tp6s/yF0NVBpss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}