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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cea9a37dae409269dd80af718dd14966a3db122b0f5d86f7e4506f6ea21d41a' 
  AND token = 'ZfuJ0Dt556lXxNIdVNEqEU6irU3OAyI8Bks07/39b4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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