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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b3c7c9d0a807a9e77519439f83d61ae5f6e07f4603706d897f969e1e14cc78a' 
  AND token = 'xkXTeBaNtq0r3R7kMyOE48C9aW1pSQZk1JO4bQpNoU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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