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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ba7d8aa326a2ed9968de8ed5947c3515a09ca11594a8e1850ef360d68afe39e' 
  AND token = 'Ng2bM9LBJ/J+uZ7iA/F+OR4fBd78/e1JB47wiOzLOSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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