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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de318efa046db75832350a257db32ea9248dd9f888d12d2b34a8b04b865b80b8' 
  AND token = 'Nje2jnf+EvAuaAjaPq5XDI8E0LTxmlymqffi+GrZSbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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