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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f91cb865a2a364542a046bfd020f80692aa8ac26b19a5ddfdd54168830b065ea' 
  AND token = 'OijmFehRwwcf8/t0jCt6SF6U6UIYnUd5dclMxLfFXLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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