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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '383a539a7d8d9db7513a48d9bcd88f05fc258496094b0492a8ab1a086e4b4b74' 
  AND token = 'qRqktnUrCxMuAD49CDgV4aV1Hm5QVdZDm4FkB3tQHLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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