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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '017e453efaa35d4a8adee78304fdf27778dd0a8cd0b5683b0dc2ffcbad23cb43' 
  AND token = 'NOkxSz5gVS/etdbJ0HKAkIw02a5wCAur+kM6BBqnLsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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