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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e3eb1056e3e4c3992626d99238e22ae82d8a5a35498b0305e23d62c46b8e77f' 
  AND token = 'TihJFiAsM+SOS6FXIa7yGOhf6ybChVIXDIdEtLiSlo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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