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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03929e61568a046b2d8de99e9b5e55002d4c6a19b0824ba3a79256ac6b79a06c' 
  AND token = 'Rz5l2AJm/qUQcMiaZz8Q1faLp+r22LjOgkLUIjc954c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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