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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '625a16c2a13fb4fde0d086385db0cd19b8a5b3c80eb615d9821067254e39625f' 
  AND token = '674Sd9mXRR9Yts9kzmYkxpGzdo5d2TVRwsmBeuKuyqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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