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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f350e209c530d8abea6a07d20bd5bb588122b660829c4ab5187c64733ac9b72b' 
  AND token = 'J/4J7T3UNQDiAuzBxsCCwAGO6hK3O+8sBhDx0AJW88A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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