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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b52d40ab0641429228036095e46d747437d96c705ce93b4886591379e0c3ffa' 
  AND token = 'Rw02k9258oRs4bzt6C4b+Ta00lfUb+8zY6+LNHsoI5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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