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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a39e63d57d87aa544e7101d5ff8d14108ac650071585c7107a3d17f9580bb97e' 
  AND token = 'w4I7nDN+o1YYteYcqC1Elqg4h3oCUCKTMVPrYiUcydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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