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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb73d766e7c0f44a68218fba94b98427631b4155226ad336c6016ca4e5a904a' 
  AND token = 'oIu3/sXwKfwOANtUfIIM+KWslkntPPk+fL+sbaEgA8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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