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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ff1c5a42bd8841fc0abeadbc5f00e7f3fa8e813bd42581275b7d11c4f7c3e7f' 
  AND token = 'n98J43EutEfRvBIJQS3wSjvOWWz/ZQ8sQI9lStdHQ30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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