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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96a40223109a7da0f56d8d03fc39090b7bea8a90a1c0ab2b81c642503d904720' 
  AND token = 'CKe5f+3k7e2CYv1DH17vxvhiukn10YFD6bsCbsBhcls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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