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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2de0760e30e1042ef39a1d9f97fc5e54c27f54bdf9ddad879d1b0d406abf521' 
  AND token = '8VlFY5h3Ov8qCXpOxNSU3DLuajcT7C5xH56ogetbBF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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