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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6261d79853d92f7529232d20dc1baa22e21101fb3abe80bfaac8238c314044ee' 
  AND token = '55hiHDhVHFEHh1c9P5MUdFWbdrORa4so2sFEQCxOXKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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