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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a2fd9538a81c50e46b3d15b7e33007b311bbfa748bb11426583bdf2081cae27' 
  AND token = 'YyIor9TCztD9hbati5CSFkvG1q2Mo9jAgV+XruBNobE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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