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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff53e5c4b348fc2ef4a23a61454fc6ec4ae6ef45242fbfca3ca887fd1e4a5e06' 
  AND token = 'eN4VqVcdO/biy29F9uJ2MEHtdkcMYOavYfUHd07gIkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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