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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce6ec278c6ca4c44a6356e57c68000812edeaf34a383c2d84fc752530af041b0' 
  AND token = '8TnerO8OJ3smtOAI/UlECIji/wb/WUusZ980u5bNUFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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