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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5977e389be33d237ea5667541a1491770ec7928ce2b36765a74a15a9af953af1' 
  AND token = 'IrHat/nOpE81Ypn7JOucxDswacsVC3mXQ8Z2dmAUytQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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