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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44deba4ec96086819313dede8cce579d2463b0ee0e662ff88cf535f7888b04b2' 
  AND token = 'j28NcdcVs7JyJG8Zv5d6UjohXeky9UQVCNmZXI8i1z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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