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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '720bfec4005ab22b2b801bd0c6df0445ebad07717c4a30437484247662c479b5' 
  AND token = 'dYrrO2mPZbHOTKRm3QddjGatal2iJj2d9dogZvuoYz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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