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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e8f3050dc867a96c5fb76f8f29eb1e3b237c7e028eb61ede00f41d598ccc758' 
  AND token = '3zNmNPZAiwmZ0yBKRbwrkb/jA/LjHPJp1di1HKbegxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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