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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a611dad1fecdcac84d40c26667fa67603cf52338e4415679fcad3f2a7ebf46e' 
  AND token = 'HjVRq38cFIEItoDmaifYXGlDWusTEVsd4rtawnbYkZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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