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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '409ddccca71e656cdf55bd4c00579ccb88f39faf99f03acfc6ac7d7330b62a6f' 
  AND token = 'GhOc/4rJkIAwF2KF/mvf4q6DO9v1tIQRu730pp5mA7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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