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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f3fc374d46a1601e6d0ef0c0582ae076706b2f688b9284e16ae5c435a8a12f2' 
  AND token = 'As+shbKmha3rVNSmU0EjO27rt5PZpPJ6YPAnIqu6jg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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