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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22b871ff1c6e31c1861692f4f61793c7be724a78cd962c303d0e91a5ce80eac4' 
  AND token = 'k04RaebFL/M36DTXUkWeJqupzG2PeMNODjMCWJr2UJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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