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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17c8a6c4e2b71d9709d258a2fc2722c2e88e7117953c0266cac2c8e66bf72e25' 
  AND token = 'CLvf79u8mevQ4LTlfvZ2g57lWRve8BpNV0qAMqBy/XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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