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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '911671ec3ed51a18566cea93c59c1d4846d20974f9b2c594ba2d422c8e95503b' 
  AND token = 'ki9XWfUc8dL1eGY5MLZk6jYtsyk+RHp5+H0o6yQjZPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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