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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c1e865d0faf1bbb5fae9712b258049a27c7d0b192e957b59307360b3b306de5' 
  AND token = 'funVT/szV/R5y9le5hOz3ck6AnIfccn6zKwQz/7N15Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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