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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cee2eb8e69e8c3f11c9e0f80c161f6e2ebbe240c1f68b106b538b91e2e9eb7b7' 
  AND token = 'A35vqPzXWCmDrVfJ/5x4m5MpJSwVNwUzyGKC4BACoYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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