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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d4f09235fc12c1ddfb95c72e8015f6c254f9b9581ecd01db9df8e7131ee754d' 
  AND token = 'YExiJ3Sq9yJPxaKirMNUbAOBNF06yBhrwXldmqeRqmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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