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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '305ee510037dde14123f833c2e0005f5323e380bd9402dc4320faa3d159e4a10' 
  AND token = 'uXN1eixiZ0f7GJD/iZb+1rNsTbKPde2FZkCmiQAhzZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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