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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db74c6a9b7ea1abf0123969c3a2a5c6510d0adfd429d76202e88d7fbed3c9b8a' 
  AND token = '4lW0LI6Cn3BQu3aLc0fmJUz2lo6TAkuSDax8NVPfgI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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