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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59121cae44408c0faa578713a40cd6f86de1330aab88838d6ff3a643120394a0' 
  AND token = 'iO+aarpO5fsl5JuNsrMGCl4YrhCuaZfne5JvxGL5vOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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