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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9b4fd52bff7f2b7483d9b14816ed49ee863812bd1f9a55aaeea8163808f223e' 
  AND token = 'omzzg4RmsuFJzIel1EHnk+MJM0ObcQg39FkQN755vfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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