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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '873bcaa5eff0bf60a713c1713a129445e7dd4628a25848258bcc7200a07c4130' 
  AND token = 'PlbBiKKdUpcFUlCvV7/NMlliYq3NUBVtO5YkfiiOYDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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