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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10b9a917ace1d4f7ae74d8bb9f536a7a1e5cfb382ca3862fa08947ac7278368d' 
  AND token = 'f55IZD1vgpNzeXitOEm61RPpP/8nCeIhU9Zj0LcGnv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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