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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18933de514d3ea28a6f3ff393d4eec873383eaaba0b84bb68173280f1a73dbc7' 
  AND token = 'A87pSRsV2Hvvej8YUk2zmz/DTfZlIAwUXX8Mzr7s9Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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