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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bd527ef673f932fb03a093cf4b01e3ebd0c922ffacca5fb5fa9c799ca935e57' 
  AND token = 'vbSNs+lGNj7l3aRrnCHyv3AJSY34FxS6VWLARNOnYLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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