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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e5a7a014f55b84758ab96bde9fd398fba51cd7c9c9be0ae56a59499f38aa460' 
  AND token = 'bXb0xHJndJ3dZ7lTGmcvwRJBR4tT2ABpIkxacpl7YgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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