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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c4e56d6883e319ad86fcc5c4e1829d4b1c014e6d90c22e1a2395996499da02b' 
  AND token = 'fuT55td2GzURYIGyv3bb58uVOiYeiKoOA8zYZPEA8nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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