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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '131088c3b165c83e0b8fde8932aeef3f4f14bf4920f223086976ed2560cac42e' 
  AND token = 'T5j1MBDdYRSZa0n0tLZeeW9Sek5Wjq2omVH1vdEwaXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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