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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f129289d2d54a2919774b3a362db3909abf4ad89d19e66384c6b3e4b852781ba' 
  AND token = 'u4C6S8rf3jsTbeyi4sE6gVqECYDz9K5w8J/BJaMoflE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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