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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b967a66bbdd838a59a01978a8e3b347e3aaf975e1d70b87096aa352a5113997' 
  AND token = 'q68wkOqWJJAi7yFqqK624CSKHjhAKz+lFTun9AsgJTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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