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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98a54c17135cf76d17aaea21f4609833015f65ee0eefa0f1629250792c3e5083' 
  AND token = 's1BqoDNDE7XNTkVTqxxRA/W9i7O2wCpc0ctOq0etWVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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