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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6763e7756cdca9c9d5c41af0c0976a50e5fb0852bae1b945c50d07d16288405' 
  AND token = 'iLDg2tFA+GfwOstG/2yksZ4HuDwheIfm4eiXJ2Fo8yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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