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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a48821d8c5d2e42860083f02aa078a8869bd2a36980166b0807d69a28bbf5fa8' 
  AND token = 'eTHlXKFsJPqxR91AB7xLJim3R8ncN49TQiL6eckvfKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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