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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3daa8970b8a6db74cd6e1506201fa40850e4309062d2e78febbb60c6de0e137' 
  AND token = '5bkv4tbnw+SaW3f6fvveM5eT4T0V5/bEWjzeqiRfT5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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