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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7740b82e188543faa88fe6ddf782cd4ed037cd2d7d6638b1ec6684c3d3cb8494' 
  AND token = 'sicVmkLSdo3XpuQn3V8UzzL47nSOzBJz1nmY5Bhy5O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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