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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae39acdb1e710fbbe5eb88097784849401d1f1ff6e00058f9eb25895bf2faf76' 
  AND token = 'Gd6oA+lbgLCoG5yx3PX0GyncIM+vHLvPAajlJCpPINA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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