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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '444326c4d2220ad67580a91e8c3c2353ca8c4e23d7a203dfad4f38c126f5f9ee' 
  AND token = 'tY+wzkey7JveuERvluqxVsJrE/o9Mciy76PJlWB7VFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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