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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0a3d0305e160e4a9d6e3f24c0c809b7c2d875bd3d3519d27ec1f35826ef0f0e' 
  AND token = '08/3EznhknGNcaIzWmQcmzWUB63QQi7zrZrM6CAaU+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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