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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1ebd0b271fdb58c5d472068416e8f5256d5308da78f5477280eacd023156b8c' 
  AND token = 'kFqHfX1/bvBplkykbCbaUw8sEMLWDHImin5FJzAHXHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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