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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a20ed7e6532745042bfb76b4f0d081f8a7ad3925c7c00ca647fd88e067a5c4d' 
  AND token = 'v82lFtCrWluUkpABNg3euOVZy5WEF2FAnaw7rU5ulL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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