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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '514f553cefb504cc0daa9a7507fef52b89d76118590ecc3bfadd5a3353c227a5' 
  AND token = 'Km9yhbBGdDMnKxLIW4u+5XBenYwUOU8rH4+RXDB5oXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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